In 1877, a German astrophysicist named Johann Karl Friedrich Zöllner published a book claiming that a medium named Henry Slade could manipulate physical objects through supernatural means. Zöllner, a respected scientist, wrote that Slade had tied knots in cords that were sealed at both ends and had removed coins from locked boxes without touching them. The book, titled Transcendental Physics, became a classic of scientific gullibility, yet it was built on experiments that allowed for easy trickery. When critics examined the conditions, they found that Slade had failed to perform any task that required genuine supernatural power, such as reversing the spirals of snail shells or linking wooden rings made of different woods. The experiments were flawed because no one was watching the table from above and below simultaneously, allowing the sitter to move the table with their knees or use sleight of hand to create the illusion of movement. This early episode set the stage for a century of debate, where the line between scientific inquiry and deliberate deception remained dangerously thin.
The Duke University Gamble
The year 1930 marked a turning point when Duke University became the second major American institution to study extrasensory perception in a laboratory setting. Under the guidance of psychologist Joseph B. Rhine, researchers began using Zener cards to test for telepathy and clairvoyance. Rhine claimed that after 90,000 trials, he had proven that extrasensory perception was an actual and demonstrable occurrence. He popularized the term parapsychology, which had been coined by philosopher Max Dessoir in 1889, to describe this new field of study. However, the results were built on methodological flaws that would eventually destroy the credibility of the work. Subjects could see the backs of the cards, which were so cheaply printed that faint outlines of the symbols were visible. In face-to-face tests, subjects could see the card faces reflected in the tester's eyeglasses or pick up clues from the experimenter's facial expressions. When Rhine took precautions to eliminate these sensory leaks, the high-scoring subjects disappeared, and the results dropped to chance levels. The discovery of these flaws led to the conclusion that the entire body of evidence collected by Rhine and other parapsychologists was anecdotal, biased, and the result of faulty observation and familiar human frailties.The Stargate Deception
Beginning in the early 1950s, the Central Intelligence Agency began funding extensive research into behavioral engineering, which eventually led to the formation of the Stargate Project. This program, which handled remote viewing research for the U.S. federal government, was terminated in 1995 with the conclusion that it was never useful in any intelligence operation. The information gathered was vague, included a lot of irrelevant and erroneous data, and there was reason to suspect that project managers had adjusted their reports to fit known background cues. In 1974, physicist Russell Targ coined the term remote viewing for use in some of his work at SRI International, but critics found that the notes given to the judges contained clues as to the order in which the sites had been visited. Marks and Kammann discovered that these cues were the reason for the experiment's high hit rates, and Marks was able to achieve 100 percent accuracy without visiting any of the sites himself. The program's failure to document any practical intelligence value and the discovery of sensory cues in the transcripts led to the project's end, leaving behind a legacy of skepticism and a warning about the dangers of government-funded pseudoscience.